WhichAI / Models / Mercury 2.5

Mercury 2.5

· verified October 3, 2026

public paid api reasoning

Provider

Statuspublic

AA Intelligence Index12.3 (official, read October 3, 2026)

Released2026-09-08

Context window260K

ModalitiesText

API price $/1M (in / out)$0.04 / $0.15 (OpenRouter)

Speedn/a

AccessAPI $0.04/$0.15 per 1M tokens on OpenRouter · listed September 8, 2026

In one line

Mercury 2.5 by Inception Labs, measured by Artificial Analysis at 12.3 on the Intelligence Index. Added to WhichAI automatically from live data on October 3, 2026: no editorial review yet, so judge it by the numbers, not by a verdict. OpenRouter's description: “Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception.”

Alternatives worth a look

Nemotron 3 Super (NVIDIA) · AA 12.8FREE on OpenRouter (nvidia/nemotron-3-super-120b-a12b:free) · open weights
Nemotron 3.5 Lightning (NVIDIA) · AA 12.9API $0.06/$0.17 per 1M tokens on OpenRouter · free route on OpenRouter (nvidia/nemotron-3.5-lightning:free) · open weights · listed August 11, 2026
gpt-oss-120b (OpenAI) · AA 11.6Open weights · free/cheap API hosts

Open Mercury's official app ↗ Open in the WhichAI app Not sure? Take the 30-second finder

Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 3, 2026. 97 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).